I'll just keep answering myself, it was all because of bad init code. Thanks for being the teddy bear ;)
On 23 November 2012 22:09, Atli Thorbjornsson <[email protected]> wrote: > I was right, I was missing options so I add the following to the init phase > > opts = setup_find_stream_info_opts(iformatCtx, codec_opts); > err = avformat_find_stream_info(iformatCtx,opts); > > instead of just > > err = avformat_find_stream_info(iformatCtx,NULL) > > And then > > avformat_write_header(outputFormatCtx,opts) > > That fixed my AAC output, it's now identical to ffmpeg's but it broke > MP3... I get the following error > > [mp3 @ 0x7f9c73060c00] Invalid audio stream. Exactly one MP3 audio stream > is required. > failed to write header: Invalid argument > > Almost there ;) > > > On 23 November 2012 18:21, Atli Thorbjornsson <[email protected]> wrote: > >> I am trying to use ffmpeg in Android as a demuxer for FLV contained audio. >> >> As a proof of concept I wrote a barebones demuxer->muxer in C that >> essentially tries to mimic this ffmpeg command >> >> ffmpeg -i input.flv -acodec copy output.aac >> >> The output of ffmpeg obviously works perfectly. But my program's output >> differs by a few bytes, I think it's the ADTS header or something. >> My program can also do FLV contained MP3 and even though my program's >> output still differs by a few bytes, my output is playable. >> >> Only too happy to share the entire source if someone has the time to wade >> through it but the basic functionality is like so: >> >> init a whole lot of stuff >> ... >> avformat_write_header(outputFormatCtx,NULL); >> while(av_read_frame(inputFormatCtx, &inputPacket)) >> if(inputPacket.stream_index == audioStreamIndex) >> av_interleaved_write_frame(outputFormatCtx, inputPacket) >> av_write_trailer(outputFormatCtx); >> >> >> I've been wading through ffmpeg.c to try and figure out what I'm missing >> but no luck as of yet. >> I'm guessing I should add some options to avformat_write_header instead >> of NULL but I haven't been able to figure out what. >> >> Many thanks, >> Atli. >> > >
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